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Also note that (similar to netstat), the TCP states are displayed. A list of open Internet sockets, along with the processes, addresses and owners. How do you track down the offending process?Īsterisk 7554 root 16u IPv4 6861 UDP *:4569 Your web-server is refusing to come up because port 80 is in use by another process. The following recipes demonstrate how lsof can be used to troubleshoot real-world problems.
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To display all internet files that are opened by foobar, you need to apply the AND (-a) condition between the switches. -n: Disable resolving of network names.ĭisplay all internet files OR files opened by user "foobar".
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-p pid: List files open by specified process./path/to/file: List processes, owners and open file descriptors that are currently using the specified file.Lsof is usually run with one or more of the following options: A non-root user will not have access to information that belongs to other users. Since lsof works by examining kernel memory, you will need root access to be able to fully utilize it.